cannot download attached files

edited 12/09/19 in Smartsheet Basics

The sheet that I have shared with a colleague has attached mp4 files but he cannot download them. The download option is grayed-out.

His permissions are set to: Editor-can share.

When he clicks to download, it asks him to log in with his Google account (as shown in the screenshot).

Does anyone know how I can change permissions so that he can download a file from the sheet?

Screen Shot 2019-04-16 at 10.55.21 AM.png